The half-life of the element Mendelevium is 51.5 days. You begin with an 85 mg sample. a) Write a function that models the half-life.
b) Find the amount remaining after 1 year.

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30